Student Exploration: Identifying Nutrients
Vocabulary: carbohydrate, disaccharide, lipid, monosaccharide, polysaccharide, protein, starch
Prior Knowledge Questions (Do these BEFORE using the Gizmo.)
1. What are the major types of nutrients you can get from food? ________________________
2. How are these nutrients used by your body? _____________________________________
Have you ever wondered what is in your food? Scientists use a variety of tests to determine the nutritional content of food. You will learn four of those tests with the Identifying Nutrients Gizmo™.
1. Below the Food samples label, drag tube A into the Food sample holder. Below the Benedict test, click the Test button. What is done in the Benedict test?
2. The Benedict test is a test for monosaccharides; simple sugars like glucose or fructose (fruit sugar). In contact with monosaccharides, the Benedict solution turns from blue to pink.
Does Sample A contain monosaccharides? _________
Note: Disaccharides such as sucrose (table sugar) and lactose (milk sugar) are more complex than monosaccharides. The Benedict test does detect disaccharides directly.
Get the Gizmo ready:
Drag Sample A into the Food sample holder.
Introduction: Most food is composed of three types of molecules: carbohydrates, proteins, and lipids. Carbohydrates such as starches and sugars are major source of energy. Simple sugars are found in sweets and fruits. Starches...
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